Postfix

https://help.ubuntu.com/community/Postfix

Packages

root@weasel:/var/log# dpkg -l *postfix*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                       Version                    Description
+++-==========================-==========================-====================================================================
ii  postfix                    2.5.1-2ubuntu1             High-performance mail transport agent


Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name                       Version                    Description
+++-==========================-==========================-====================================================================
pn  libsasl2                   <none>                     (no description available)
ii  libsasl2-2                 2.1.22.dfsg1-18ubuntu2     Cyrus SASL - authentication abstraction library
ii  libsasl2-modules           2.1.22.dfsg1-18ubuntu2     Cyrus SASL - pluggable authentication modules
ii  sasl2-bin                  2.1.22.dfsg1-18ubuntu2     Cyrus SASL - administration programs for SASL users database

Config files

• /etc/postfix/main.cf
• /etc/postfix/master.cf
• /etc/default/saslauthd

Test output

root@weasel:/etc/default# telnet finninday.net 25
Trying 24.21.185.50...
Connected to finninday.net.
Escape character is '^]'.
220 weasel.finninday.net ESMTP Postfix (Ubuntu)
ehlo finninday.net
250-weasel.finninday.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
quit
221 2.0.0 Bye
Connection closed by foreign host.

new user

After creating a new account with "adduser", it is still necessary to set a sasl password.

This will show all sasl accounts:

 sasldblistusers2

This will create a new sasl account:

 saslpasswd2 -c

I also had to create a "Maildir" directory in the new user's home directory. Not sure if it was necessary to restart saslauthd and postfix, but I did this time. Now it works.

It was instructive to watch /var/log/mail.log, but I had to resist the temptation to try to troubleshoot the PAM-related messages.